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Layer Height Calculator

Calculate optimal layer height from nozzle diameter and print quality target. Set layer resolution as a fraction of nozzle size for best FDM results.

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Inputs that matter
Nozzle Diameter, Print Quality
Output to expect
Layer Height Calculator
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Nozzle Diameter Rule

Optimal layer height is 25–75% of nozzle diameter. A 0.4 mm nozzle works best at 0.10–0.30 mm layers. Exceeding 80% of nozzle diameter reduces extrusion consistency.

Layer height = nozzle diameter × quality factor (0.25–0.75)

Quality Tier Selection

Draft: 50–75% of nozzle (fast, visible layers). Standard: 30–50% (balanced). Fine/detail: 20–30% (slow, smooth surfaces).

Draft 0.28 mm | Standard 0.20 mm | Fine 0.12 mm (0.4 mm nozzle)

Step Height Compatibility

Layer height should be a multiple of motor step resolution (Z-axis). Common magic numbers for 0.4 mm nozzle: 0.08, 0.12, 0.16, 0.20, 0.24, 0.28 mm.

Z step alignment improves surface consistency on some printers

Updated: July 2026

Example Scenarios

Standard 0.20 mm layer height (50% rule). Good balance of speed and quality for functional parts at 50–60 mm/s print speed.

Draft 0.36 mm (60%) or standard 0.28 mm (47%). Larger nozzle enables faster volumetric flow for big structural prints.

Fine 0.06–0.08 mm layers (24–32%). Slow print but captures small features on 28 mm scale miniatures.

Common Mistakes to Avoid

Setting layer height above 80% of nozzle diameter

Layers too thick for the nozzle (e.g., 0.36 mm on 0.4 mm nozzle) produce inconsistent extrusion and poor layer bonding. Upgrade nozzle or reduce layer height.

Using fine layers without adjusting print speed

Thin layers at high speed starve extrusion. Reduce speed or increase temperature when going below 0.12 mm on a 0.4 mm nozzle.

FAQ

0.20 mm is the most common standard. Use 0.28 mm for draft speed, 0.12–0.16 mm for visible surfaces and fine detail.

Yes — 0.10 mm is 25% of nozzle diameter, within the fine range. Print time roughly doubles vs 0.20 mm. Diminishing returns below 0.08 mm on most FDM machines.

Thicker layers can improve interlayer adhesion per unit time but reduce Z-axis resolution. 0.20 mm is a good strength/speed compromise for structural PLA and PETG parts.

First layer is often 90–100% of nozzle diameter (0.36–0.40 mm on 0.4 nozzle) for bed adhesion regardless of subsequent layer height setting.

Thinner layers need slower speeds or lower acceleration to maintain volumetric flow limits. Halving layer height roughly doubles print time at the same speed.

About Layer Height Calculator

Layer height is the primary resolution control in FDM printing. This calculator recommends optimal layer height as a fraction of nozzle diameter for draft, standard, and fine quality tiers.